Laser welding process for lithium ion battery

From the manufacturing of lithium-ion battery cells to the battery pack group, welding is a very important manufacturing process. The conductivity, strength, air tightness, metal fatigue and corrosion resistance of lithium-ion battery are typical battery welding quality evaluation standards. The choice of welding method and welding process will directly affect the cost, quality, safety and consistency of lithium-ion battery.

In many welding methods, laser welding of lithium-ion battery processing stands out with the following advantages: first, laser welding has high energy density, small welding deformation and small heat affected zone, which can effectively improve the precision of parts. The welding seam is smooth and free of impurities, uniform and dense, and does not need additional grinding work. Secondly, laser welding can be accurately controlled, with small focusing spot, high-precision positioning and matching In addition, the laser welding of thin plate or thin wire will not be easy to be affected by remelting as arc welding.

The advantage of laser welding technology is that it can weld a wide range of materials, which can realize the welding between different materials. In the welding process of power lithium-ion battery, welding process technicians will select appropriate laser and welding process parameters according to the battery material, shape, thickness, tension requirements, etc., including welding speed, waveform, peak value, welding head tilt angle, etc. to set reasonable welding process parameters, so as to ensure that the final welding effect meets the requirements of power lithium battery manufacturers.